Environmental Products

GypsanderTM - Gypsum-based neutral soil adjustment agent -

Photo: Gypsander - Gypsum-based neutral soil adjustment agent -

GypsanderTM is a gypsum-based soil adjustment agent that rapidly modifies sludge and soft soil at construction sites into a form that is safe and friendly to humans and other living things, contributing to soil recycling.

Product Type

Gypsander-C Gypsander-C, chiefly composed of gypsum plaster, is an inorganic solidifier recommended for adjusting soil of relatively low water content.
Gypsander-B Gypsander-B is a solidifier produced by combining polymer flocculant with Gypsander-C. Mud is solidified instantly by Gypsander-B.


  1. Strength 1
    Gypsum (a by-product of titanium dioxide) with improved functionality
  2. Strength 2
    Effective in various types of mud
  3. Strength 3
    pH neutral
  4. Strength 4
    Safe and environmentally friendly
  5. Strength 5
    Deodorant effect
  6. Strength 6
    Solidification time can be adjusted
  7. Strength 7
    Simultaneous solidification and modification without impairing the effects of insolubilizer and decomposer

Typical Applications

  • Solidification, modification, and recycling of mud generated at construction sites
  • Hardening of soft soil
  • Cleanup of contaminated soil concurrently performed with solidification and modification of ground


Effective in various types of mud.

Graph: Strength lab test results of polluted mud - One hour after addition

pH neutral

Graph: pH transition (Comparison with cement)
As the product itself is pH neutral, so long as the original soil is neutral, the adjusted soil will surely be neutral no matter how much the product is added.

Safe and environmentally friendly

GypsanderTM is an environmentally friendly solidifier; leached amount and content are periodically measured and certified.
In addition, acute toxicity testing with Japanese rice fish has proven the product safe even in 100% test solution.

Deodorant Effect

Graph: Transition of additive amount and ammonia generation
GypsanderTM is mixed with special iron to reduce foul odor by solidifying hydrogen sulfide in dredged sediments, reducing work risk.
Soil containing high levels of organic substances can generate ammonia when alkalized, but this is not true of GypsanderTM, which creates no pH changes.

Technical Certificate

Technical Certificate : Gypsander
The Society of Materials Science, Japan
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